Used 4.6l 4v Forged CP Pistons. Standard bore size and 8.5:1 compression ratio. These came out of a motor I had work done to. Pistons to wall clearance was too much for what I was doing with my engine; therefore, I went up one size. Comes with a new unopened pack of total seal rings $250 value. Great way to get a cheap forged piston setup in your 4.6. Also they are an older cp piston which is way they dont have a part number on them. I appreciate your time and your offers.